fix: Render koopa sprites with transparent background #85
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Description
![koopa_non_transparent](https://user-images.githubusercontent.com/12224090/97070268-baeb5b00-159c-11eb-877f-e67b3b346d10.png)
Updated koopa sprites to a transparent background. The current koopas render with a non-transparent background:
Screen capture of game rendered with koopa sprites on a transparent background:
![koopa_transparent](https://user-images.githubusercontent.com/12224090/97070298-dd7d7400-159c-11eb-9f4d-387fd9ff8bac.png)
Fixes #84.